Abstract: A microwave processing system is disclosed. The system is particularly useful for concurrently controlling a plurality of chemical reactions from a single microwave source. The system comprises a source that produces electromagnetic radiation in the microwave range; a waveguide in communication with the source and into which the source propagates microwave radiation; a resonator in communication with the waveguide; and an adjustable dynamic moderating device between the waveguide and the resonator for moderating the wave energy passing from the waveguide to the resonator without substantially changing the propagated mode in the waveguide.

Abstract: Disclosed is a wave guide used in a microwave oven, by which superimposed high-frequency microwaves are radiated towards food to be heated, and distorted waves included in the high-frequency microwaves are removed. The wave guide has a housing provided with a magnetron, a mode transducer disposed in the housing so as to superimpose and distribute a high-frequency microwave radiated from the magnetron, and a differential mode absorber for absorbing a distorted wave included in the high-frequency microwave which has been passed through the mode transducer. The mode transducer includes a first hollow-frustuconical member welded to an inner wall of the housing, a second hollow-frustuconical member accommodated in the first hollow-frustuconical member, and a transmission line attached to an inner wall of the second hollow-frustuconical member.

Abstract: A method for controlling the microwave feed in a microwave oven, as well as a microwave oven for implementing the method, is disclosed. The power level (P) of the microwaves is controlled by periodic activation or inactivation of the microwave radiation source of the oven during a sequence of control cycles. The oven has a rotary bottom plate carrying the food or dish, and/or a rotary field agitator or aerial. The heating uniformity is improved by adjusting to one another the duration of the control cycle and the revolution time of the bottom plate or of the field agitator or aerial, while taking into consideration the aimed-at power level. In a procedure composed of several steps with different power levels and heating times, the heating times of the different steps are also adjusted to the current control-cycle duration.

Abstract: This invention relates to a microwave oven which can generate and transfer maximum microwave power to food being cooked irrespective of the weight and size of that food being cooked, thereby shortening cooking time and improving the efficiency of cooking. The microwave oven includes a sensor for sensing the food load on a turntable in a heating chamber, a microcomputer for controlling the oven in response to key signals input by the user and in response to the load sensor, a power supply for supplying power to a magnetron to operate the magnetron under the control of the microcomputer, an impedance matching device for matching impedance by moving a reflector in a waveguide fixed to the heating chamber, a match driver for controlling the impedance matching device under the control of the microcomputer, a variable vane mounted in an opening of the heating chamber, and a variable vane driving means for rotating the variable vane under the control of the microcomputer.

Abstract: A microwave oven is provided with a removable shelf for dividing a cavity into upper and lower heating zones. Microwave energy from a magnetron is selectively introduced into the upper and lower heating zones to controllably cook separate food items placed therein.

Abstract: There is disclosed a heating cooking device including a heating chamber for heating an object to be heated, a high-frequency oscillator for generating high-frequency electromagnetic waves, a wave guide for guiding the high-frequency electromagnetic waves from the high-frequency oscillator to the heating chamber, a rotary table for supporting thereon the object to be heated for rotation therewith, and a wave stirrer fan for stirring the electromagnetic waves in the heating chamber. A feeder port of the wave guide is disposed at a side of the heating chamber, and the wave stirrer fan is disposed within the wave guide in opposed relation to the feeder port. The high-frequency oscillator is disposed on the side of the feeder port. The feeder port is larger in size than the wave stirrer fan.